class Person:

    def set_name(self, name):
        self.name = name

    def get_name(self):
        return self.name

    def greet(self):
        print("Hello, world! I'm: {}.".format(self.name))


if __name__ == "__main__":
    foo = Person()
    bar = Person()
    foo.set_name("Luke Skywalker")
    bar.set_name("Anakin Sykwalker")
    foo.greet()
    bar.greet()
